Results 1 to 10 of about 7,701 (182)
Clustering of X-ray selected active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 A total of 235 active galactic nuclei (AGN) from two different soft X-ray surveys [the ROSAT Deep Survey (DRS) and the ROSAT International X-ray Optical Survey (RIXOS)] with redshifts between 0 and 3.5 are used to study the clustering of X-ray selected ...
Barcons, Xavier +7 more
core +5 more sources
Unwrapping the X‐ray spectra of active galactic nuclei [PDF]
Astronomische Nachrichten, 2016 Active galactic nuclei (AGN) are complex phenomena. At the heart of an AGN is a relativistic accretion disk around a spinning supermassive black hole (SMBH) with an X-ray emitting corona and, sometimes, a relativistic jet.
C.S. Reynolds, Reynolds, C. S.
core +4 more sources
X-ray variability time scales in active galactic nuclei [PDF]
Astronomy & Astrophysics, 2009 X-ray variability in active galactic nuclei (AGN) is commonly analysed in terms of the power spectral density (PSD). The break observed in the power spectrum can be interpreted as a characteristic X-ray variability time scale.
W. Ishibashi, T. J.-L. Courvoisier
core +3 more sources
Active galactic nuclei at gamma-ray energies [PDF]
Comptes Rendus Physique, 2016 International audienceActive Galactic Nuclei can be copious extragalactic emitters of MeV–GeV–TeV γ rays, a phenomenon linked to the presence of relativistic jets powered by a super-massive black hole in the center of the host galaxy.
Berrie Giebels +3 more
exaly +2 more sources
The distribution of galactic neighbours of X-ray-selected active galactic nuclei
Monthly Notices of the Royal Astronomical SocietyWe combine X-ray data from the X-ray Multi-Mirror Mission 12th data release (4XMM DR12) and the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) Final Equatorial-Depth Survey (eFEDS) early data release catalogues with the Galaxy and ...
Michael G Watson (15439955) +3 more
core +2 more sources
X-Ray Eclipses of Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2017 Abstract X-ray variation is a ubiquitous feature of active galactic nuclei (AGNs); however, its origin is not well understood. In this paper, we show that the X-ray flux variations in some AGNs, and correspondingly, the power spectral densities (PSDs) of the variations, may be interpreted as being caused by absorptions of eclipsing ...
Fupeng Zhang, Qingjuan Yu, Youjun Lu
openaire +2 more sources
Search for X-ray occultations in active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 Accepted for publication in MNRAS. 15 pages, 7 figures. Table 2 not included, will be available in the published version.
G. Torricelli Ciamponi +3 more
openaire +2 more sources
X-ray absorption and reflection in active galactic nuclei [PDF]
The Astronomy and Astrophysics Review, 2009 Accepted for publication in the Astronomy and Astrophysics Review. 58 pages, 9 figures.
Turner, T, Miller, L
openaire +3 more sources
The Astrophysical Journal, 2023 We report on the 2019 XMM-Newton+NuSTAR monitoring campaign of the Seyfert galaxy NGC 2992, observed at one of its highest flux levels in the X-rays.
Alfredo Luminari +10 more
doaj +1 more source
Rapid X-Ray Variability in Active Galactic Nuclei [PDF]
Symposium - International Astronomical Union, 1986 SummaryRecent EXOSAT observations of active galactic nuclei are presented. Unlike earlier X-ray satellites (all of which flew in low earth orbit), the deep orbit of EXOSAT allows long continuous observations of celestial X-ray sources, uninterrupted by earth occultation etc.
P. Barr +4 more
openaire +1 more source